I’ve seen a similar pattern of thoughtless behavior in a number of embassies and consulates. I get the impression that many of the workers consider themselves to be the gatekeepers, rather than the ambassadors of their countries. I far more frequently get treated abruptly, than with any sort of care or consideration, at a whole raft of places such as the Chinese, Cambodian, Indian, Lao (although in BKK, the Lao embassy isn't too bad) and Burmese embassies, and even the Thai consulate in NYC, to name a few. And it isn't just Americans that get the treatment. I have accompanied many Thai friends to get their Schwengen visas for Europe in one of the many embassies that can issue such documents, and more often than not, witness fairly rough treatment. The attitude seems to be: prove that you will leave (my country) quickly (after spending what money you might bring), and not cause trouble. However, it’s sad to say but overseas American embassies in a number of Asian countries are the absolute worst. Walk into one with a local who is trying to get a visa in a place like, say, Bangkok, and you will get a good education about how America projects its attitudes to the rest of the world.

I didn't plan on writing with such vigor, but this is a good question, and something that has bothered me for quite some time.